London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your Camden property, building regulations, structural steelwork and Party Wall notices.
For Camden homeowners in Victorian and Edwardian terraces, a rear dormer drawings package is the full measured-survey-to-submission drawing set London Borough of Camden needs in order to determine an application: existing and proposed plans, elevations and sections at 1:100 and 1:50, a location and site plan, and the supporting statements the case officer asks for.
Prepared and reviewed by the chartered technologist team at Architectural Drawings London — MCIAT chartered, £2m PI insured.Last reviewed 2026-08-03.


London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your Camden property, building regulations, structural steelwork and Party Wall notices.
Housing stock in Camden: Victorian and Edwardian terraces, Georgian townhouses in Bloomsbury and Hampstead, post-war mansion blocks, modern developments in King's Cross.
Character: Creative, affluent in Hampstead and Primrose Hill; dense mixed-use around Camden Town and Kings Cross; academic character in Bloomsbury.
Article 4: Article 4 removes permitted development for HMO conversions (C3 to C4) across the borough, plus restrictions on basement extensions in 12 conservation areas.
Basement policy: Camden's basement policy (Policy A5) restricts single-storey basements to 50% of garden area; double-storey basements generally refused outside commercial zones.
We confirm whether your Camden rear dormer qualifies for Permitted Development — checking volume limits (40m³ terraced, 50m³ semi/detached), Article 4, conservation area and prior extension history.
If PD applies, we obtain a Lawful Development Certificate for certainty. If not, we submit full planning with Design & Access Statement to Camden Council.
Full-width flat-roof rear dormer with matching materials, set in from party walls, cheeks clad to match existing roof — the design that Camden Council approves most readily.
Part B fire escape (protected staircase, fire doors, smoke alarms), Part K staircase, Part L insulation, Part E acoustic separation.
Steel ridge beam, purlin supports, dormer framing, floor joist upgrade — chartered engineer sign-off for Building Control.
Most rear dormers in Camden's terraced streets trigger Section 6 Party Wall notices. We draft, serve and coordinate the process.

Single planning or regs submission.
Planning + building regs + structural.
Listed, conservation, complex sites.
Move the controls for an indicative figure. It anchors your budget — it is not a quote. Every project is priced after a free survey.
Build costs are separate and quoted by your contractor. See our published fees.
Every Camden postcode district we draw in, the stock that dominates it and the authority that validates a rear dormer there. Camden fees below are the statutory England rates for 2026, not rear dormer estimates.
| Postcode | Area | Dominant stock | What it means for a rear dormer |
|---|---|---|---|
| NW1 | Camden Town / Regent's Park | Victorian terraces, mansion blocks | NW1 straddles a boundary: Camden Town / Regent's Park addresses fall to Camden Council or Westminster City Council, so confirm which authority validates the rear dormer before submitting NW1 drawings. |
| NW3 | Hampstead / Belsize Park | Georgian and Victorian villas, listed buildings | Hampstead / Belsize Park sits wholly inside NW3, so Camden Council validates every rear dormer submitted from an NW3 address. |
| NW5 | Kentish Town / Gospel Oak | Victorian terraces | Kentish Town / Gospel Oak sits wholly inside NW5, so Camden Council validates every rear dormer submitted from an NW5 address. |
| NW6 | Kilburn / West Hampstead / Queen's Park | Mansion blocks, post-war flats | A rear dormer in Kilburn / West Hampstead / Queen's Park may land with Camden Council or Brent Council — NW6 crosses the boundary, and the NW6 policies map decides it street by street. |
| W1T | Fitzrovia | Georgian terraces, Victorian mansion blocks | A rear dormer in Fitzrovia may land with Camden Council or Westminster City Council — W1T crosses the boundary, and the W1T policies map decides it street by street. |
| WC1A | Bloomsbury | Victorian and Edwardian terraces | A rear dormer at an WC1A address in Bloomsbury is determined by Camden Council under its own Local Plan policies for Bloomsbury. |
Roof pitch, wall build-up and plot depth change every few Camden streets, and each one changes what a rear dormer can achieve at that address.
Camden conservation designations: there are 40 across Camden Council, Camden Town, Fitzrovia, Hampstead among them. Designation costs a Camden owner the permitted-development route: a rear dormer then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Camden Town is the Camden designation that most often changes a rear dormer design.
What Article 4 removes near Camden: Article 4 removes permitted development for HMO conversions (C3 to C4) across the borough, plus restrictions on basement extensions in 12 conservation areas. Before pricing a rear dormer we check whether the N1C address is inside the mapped area, because Camden Council draws the Camden boundary street by street rather than across the whole of Camden.
Camden below-ground policy: Camden's basement policy (Policy A5) restricts single-storey basements to 50% of garden area; double-storey basements generally refused outside commercial zones. Any rear dormer in Camden that goes below existing foundations triggers two months notice under section 6 of the Party Wall etc. Act 1996, and Camden Council will want the N1C ground and groundwater position set out.
What Camden is built from: Victorian and Edwardian terraces, Georgian townhouses in Bloomsbury and Hampstead, post-war mansion blocks, modern developments in King's Cross. Creative, affluent in Hampstead and Primrose Hill; dense mixed-use around Camden Town and Kings Cross; academic character in Bloomsbury. That mix decides the rear dormer route in Camden more than the postcode does, and it is what a Camden Council case officer reads first. A householder application costs £548 paid to Camden Council direct, with 8 weeks to a decision once validated.
Sources for this Camden rear dormer page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.
Direct answers to the questions Camden homeowners ask every week about rear dormer drawings.
Start a free quote →It depends on your exact address in Camden. Most standard loft conversions qualify as Permitted Development (no planning permission needed) if under 40m³ for terraced or 50m³ for semi-detached, with matching materials and 20cm eaves setback. However Camden has Article 4 Directions that may remove these rights — and flats, conservation areas and listed buildings always require full planning. We confirm permitted development eligibility at the free feasibility visit. Full-width rear dormers are the most common PD loft type in Camden — provided the volume, materials and setback conditions are met. We check every condition before committing to a route.
A Camden rear dormer has two cost lines: our architectural package (drawings, building regulations and structural calculations, quoted as one fixed figure) and the build, which moves with access, floor area and specification — an en-suite adds plumbing runs and drainage. See our fees.
A full-width rear dormer in Camden typically adds 15–25 square metres of habitable floor area — enough for a double bedroom with en-suite, or two single bedrooms. The flat roof gives full standing height across the entire width of the house, unlike a rooflight-only conversion which is constrained by the roof pitch.
Rear dormers in Camden's conservation areas usually need full planning permission because PD rights are restricted. However, because they face the rear (not the street), Camden Council typically views them more favourably than front dormers or mansards. A well-designed rear dormer with matching materials and sensitive proportions has a strong approval record.
A standard rear dormer in Camden takes 8–12 weeks to build once on site. Our architectural package takes 3–5 weeks from instruction to submission. Building Control approval adds 2–4 weeks. Total timeline from survey to move-in: approximately 4–5 months.

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